
#include <iostream>
using namespace std;
int w, x, h, ans, q;
int a[21][21][21];
int main() {
	cin >> w >> x >> h >> q;
	while (q--) {
		int x1, y1, z1, x2, y2, z2;
		cin >> x1 >> y1 >> z1 >> x2 >> y2 >> z2;
		for (int i = min(x1, x2); i <= max(x1, x2); i++) {
			for (int j = min(y1, y2); j <= max(y1, y2); j++) {
				for (int k = min(z1, z2); k <= max(z1, z2); k++) {
					a[i][j][k] = 1;
				}
			}
		}
	}
	for (int i = 1; i <= w; i++) {
		for (int j = 1; j <= x; j++) {
			for (int k = 1; k <= h; k++) {
				if (a[i][j][k] == 0) {
					ans++;
				}
			}
		}
	}
	cout << ans << endl;
	return 0;
}